Characterization of Rh/Al2O3 catalysts after calcination at high temperatures under oxidizing conditions by luminescence spectroscopy and catalytic hydrogenolysis

Vladimir O. Stoyanovskii, Alexei A. Vedyagin, Galina I. Aleshina, Alexander M. Volodin, Alexander S. Noskov

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Rhodium/alumina catalysts with Rh loadings of 0.01-0.5 wt.% with substantially different thermal stability of supports with respect to phase transformation to corundum were studied. It was shown that the stability of alumina support with respect to its transformations to corundum is one of the important factors accounting for irreversible deactivation of Rh/Al2O3 catalysts. We used laser-induced luminescence (LIL) of Cr3+ impurity and Rh3+ in α-Al2O3 and XRD for studying catalysts with different calcination temperatures. Catalytic ethane hydrogenolysis was used as a test for Rh loading on the catalyst surface. This method reliably detects Rh ions on the surface starting from concentrations as low as 0.01%. The results of LIL spectroscopy indicated that in all cases Rh3+ ions were incorporated in the bulk of the newly formed α-Al2O3 phase, and quite possible can initiates the formation of the corundum phase in catalysts with high-thermal stability.

Original languageEnglish
Pages (from-to)141-146
Number of pages6
JournalApplied Catalysis B: Environmental
Volume90
Issue number1-2
DOIs
Publication statusPublished - 25 Jul 2009
Externally publishedYes

Fingerprint

Hydrogenolysis
Aluminum Oxide
luminescence
Calcination
Luminescence
catalyst
spectroscopy
Corundum
Spectroscopy
corundum
Catalysts
aluminum oxide
Thermodynamic stability
Alumina
Temperature
laser
Ions
rhodium
Rhodium
Ethane

Keywords

  • Ethane hydrogenolysis
  • Luminescence
  • Rh/AlO
  • Rhodium catalyst

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

Cite this

Characterization of Rh/Al2O3 catalysts after calcination at high temperatures under oxidizing conditions by luminescence spectroscopy and catalytic hydrogenolysis. / Stoyanovskii, Vladimir O.; Vedyagin, Alexei A.; Aleshina, Galina I.; Volodin, Alexander M.; Noskov, Alexander S.

In: Applied Catalysis B: Environmental, Vol. 90, No. 1-2, 25.07.2009, p. 141-146.

Research output: Contribution to journalArticle

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AU - Noskov, Alexander S.

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